/Engine/Source/Runtime/AudioMixer/Public/AudioMixerSubmix.h
Gets the most recent phase values for each corresponding value in InFrequencies (in Hz). This requires StartSpectrumAnalysis to be called first.
void GetPhaseForFrequencies ( const [TArray](API\Runtime\Core\Containers\TArray)< float > & InFrequencies, [TArray](API\Runtime\Core\Containers\TArray)< float > & OutPhases )